<template>
<div>
    <el-card >
    <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>用户管理</el-breadcrumb-item>
            <el-breadcrumb-item>用户列表</el-breadcrumb-item>
        </el-breadcrumb>

    <el-button type="primary" size="normal" class="addbtn" @click="showAddCateDialog">添加分类</el-button>

    <tree-table :data="catelist" :columns="columns" :selection-type="false" :expand-type="false" :show-index="true" index-text="#" border :show-row-hover="false">
        <template slot="isok" slot-scope="scope">
            <i class="el-icon-success" v-if="scope.row.cat_deleted === false" style="color: lightgreen"></i>
            <i class="el-icon-error" v-else style="color: red"></i>
        </template>
        <template slot="order" slot-scope="scope">
            <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag> 
            <el-tag size="mini" type="success" v-else-if="scope.row.cat_level === 1">二级</el-tag> 
            <el-tag size="mini" type="warning" v-else>三级</el-tag> 
        </template>
         <template slot="opt" slot-scope="scope">
           <el-button type="primary" icon="el-icon-search" size="mini">编辑</el-button>
           <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
        </template>
    </tree-table>

    <!-- 分页区域 -->
    <el-pagination
      @size-change="handleSizeChange"
      @current-change="handleCurrentChange"
      :current-page="queryInfo.pagenum"
      :page-sizes="[1, 2, 5, 10]"
      :page-size="queryInfo.pagesize"
      layout="total, sizes, prev, pager, next, jumper"
      :total="total">
    </el-pagination>
    </el-card>

    <!-- 添加分类对话框 -->
    <el-dialog
    title="添加分类"
    :visible.sync="addCateDialogVisible"
    width="50%" @close="addCateDialogClosed">

    <el-form :model="addCateForm" :rules="addCateFormRules"  label-width="100px" ref="addCateFormRef">
        <el-form-item label="分类名称" prop="cat_name" >
                <el-input v-model="addCateForm.cat_name"></el-input>
                </el-form-item>
        <el-form-item label="父级分类">
            <el-cascader
                v-model="selectedKeys"
                :options="parentCateList"
                :props="cascaderProps"
                @change="parentCateChanged"
                clearable >
            </el-cascader>
        </el-form-item>
    </el-form>
    <span slot="footer" class="dialog-footer">
    <el-button @click="addCateDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addCate">确 定</el-button>
    </span>
</el-dialog>
</div>
</template>
  
<script>
export default {
    data() {
        return {
            catelist: [],
            queryInfo: {
                pagenum: 1,
                pagesize: 5
            },
            total: 0,
            columns: [
            {
                label: '分类名称',
                prop: 'cat_name',
            },
            {
                label: '是否有效',
                type: 'template',
                template: 'isok'
            },
            {
                label: '排序',
                type: 'template',
                template: 'order'
            },
            {
                label: '操作',
                type: 'template',
                template: 'opt'
            }
            ],
            addCateDialogVisible: false,
            addCateForm: {
                cat_name: '',
                cat_pid: 0,
                cat_level: 0
            },
            addCateFormRules: {
                cat_name: [
                    {required: true, message: '请输入分类名称', trigger: 'blur'}
                    ]
            },
            parentCateList: [],
            cascaderProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children',
                expandTrigger: 'hover',
                checkStrictly: true
            },
            selectedKeys: []
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        async getCateList(){
          const {data:res} = await this.$http.get('categories', {params: this.queryInfo})
          if(res.meta.status !== 200) {
              return this.$message.error('获取失败')
          }
          this.catelist = res.data.result
          this.total = res.data.total
        },
        handleSizeChange(newSize) {
            this.queryInfo.pagesize = newSize
            this.getCateList()
        },
        handleCurrentChange(newPage) {
            this.queryInfo.pagenum = newPage
            this.getCateList()
        },
        showAddCateDialog() {
            this.getParentCateList()
            this.addCateDialogVisible = true
        },
        async getParentCateList() {
           const {data: res} = await this.$http.get('categories', { params: { type: 3 }})
           if(res.meta.status !==200) {
               return this.$message.error('获取父级分类失败')
           }
           this.parentCateList = res.data
          
          
        },
        parentCateChanged() {
            if(this.selectedKeys.length > 0) {
                this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
                this.addCateForm.cat_level = this.selectedKeys.length 
                return
            }else {
                this.addCateForm.cat_pid = 0
                this.addCateForm.cat_level = 0
            }
        },
         addCate() {
            this.$refs.addCateFormRef.validate(async valid => {
                if(!valid) return
                const {data: res} = await this.$http.post('categories', this.addCateForm)
                if(res.meta.status !== 201) {
                    return this.$message.error('添加分类失败')
                }
                 this.$message.success('添加分类成功')
                this.addCateDialogVisible = false
                this.getCateList()
                
            })
        },
        addCateDialogClosed() {
            this.$refs.addCateFormRef.resetFields()
            this.selectedKeys = []
            this.addCateForm.level = 0
            this.addCateForm.cat_pid = 0
        }
    }
}
</script>

<style lang="less" scoped>
    .el-breadcrumb {
        margin-bottom: 15px;
    }
    .addbtn {
        margin-bottom: 15px;
    }
    .el-cascader {
        width: 100%;
    }
    
</style>